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Guarantees - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended
May 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Guarantee Obligations [Line Items]      
Equity method investment, ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Term of line-of-credit agreement 12 months    
Maximum amount of advances requested and unpaid principal balance $ 15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Guarantee expiration date   May 31, 2015  
Outstanding balance of line of credit   $ 6,895,000us-gaap_GuaranteeObligationsMaximumExposure $ 4,548,000us-gaap_GuaranteeObligationsMaximumExposure
Base Rate      
Guarantee Obligations [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Line of credit base interest with floor rate 3.75%rmax_DebtInstrumentVariableRateFloor
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember